34~39p 12231/5{2,3,4,5}453/공집합,{2},{4}28 25(64)(11)5/2,432{3.6}6/4(29)(40){3,5},{3,5,6},{3,5,7},{3,5,6,7} 2(25)12235(56) 9{1,2,3,6},{3,6,9}4
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